期刊
EVOLUTION
卷 64, 期 11, 页码 3190-3197出版社
WILEY
DOI: 10.1111/j.1558-5646.2010.01066.x
关键词
Cooperation; eusociality; morphological caste; reproductive skew; specialization
资金
- Association for the Study of Animal Behaviour
- Natural Environment Research Council, Magdalene College, Cambridge
- National Research Foundation
- BBSRC [BB/H022716/1] Funding Source: UKRI
- NERC [NE/E013481/1] Funding Source: UKRI
- Biotechnology and Biological Sciences Research Council [BB/H022716/1] Funding Source: researchfish
- Natural Environment Research Council [NE/E013481/1] Funding Source: researchfish
The specialization of body shape to an individual's role within society represents a pinnacle of social evolution. Although commonplace among social insects, divergence in the body shapes of breeders and helpers has to date been documented in just one social vertebrate, the naked mole-rat, Heterocephalus glaber; an extraordinary species in which large colony size and frequent inbreeding may have favored the evolution of such specialization. Here, we present new evidence of morphological divergence between breeders and helpers in the Damaraland mole-rat, Fukomys damarensis; a much less socially extreme species that reflects an independent evolutionary origin of sociality. Using longitudinal data from wild populations, we show that dominant female Damaraland mole-rats, like many social insect queens, have a significantly more elongate body shape than subordinates. This difference arises not from a pre-existing difference in the body shapes of subordinates that do, and those that do not, become dominant, but from a modification to the growth trajectory of subordinates on dominance acquisition. Our findings reveal a wider role for morphological divergence within vertebrate societies and, as Damaraland mole-rats neither live in unusually large groups nor inbreed, suggest that circumstances favoring the evolution of such specializations may be more widespread among vertebrates than previously supposed.
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